On Wed, Sep 02, 2020 at 11:15:47AM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
> staging-testing
> head: 4c6491a343e91a5a2a699b0b545f8ba1ec1e8c65
> commit: fbcfdfab4a2c4ec5e2195929528506fec39388f3 [62/88] staging: emxx_udc:
> Allow for building on !ARM
> compiler: riscv32-linux-gcc (GCC) 9.3.0
[snip]
> >> drivers/staging/emxx_udc/emxx_udc.c:2095:48: warning: Uninitialized
> >> variable: ep [uninitvar]
> list_for_each_entry(ep, &udc->gadget.ep_list, ep.ep_list) {
> ^
This warning's bogus. The ep here refers to a member name, not the
variable ep. I'll send a patch for the other warnings though.
>
> #
> https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git/commit/?id=fbcfdfab4a2c4ec5e2195929528506fec39388f3
> git remote add staging
> https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
> git fetch --no-tags staging staging-testing
> git checkout fbcfdfab4a2c4ec5e2195929528506fec39388f3
> vim +/result +839 drivers/staging/emxx_udc/emxx_udc.c
>
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 785
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 786
> /*-------------------------------------------------------------------------*/
> e2d34dfdffcfd1 Cristian Sicilia 2018-11-17 787 static int
> _nbu2ss_out_dma(struct nbu2ss_udc *udc, struct nbu2ss_req *req,
> e2d34dfdffcfd1 Cristian Sicilia 2018-11-17 788 u32
> num, u32 length)
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 789 {
> 5a012f67cbcb20 Alexis Lothoré 2017-05-10 790 dma_addr_t
> p_buffer;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 791 u32 mpkt;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 792 u32 lmpkt;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 793 u32 dmacnt;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 794 u32 burst =
> 1;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 795 u32 data;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 796 int result
> = -EINVAL;
> 64407f6e7d158e Carmeli Tamir 2018-11-07 797 struct fc_regs __iomem
> *preg = udc->p_regs;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 798
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 799 if (req->dma_flag)
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 800 return 1;
> /* DMA is forwarded */
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 801
> 8b77d94e69c33f Saiyam Doshi 2019-09-08 802 req->dma_flag = true;
> 5a012f67cbcb20 Alexis Lothoré 2017-05-10 803 p_buffer = req->req.dma;
> 5a012f67cbcb20 Alexis Lothoré 2017-05-10 804 p_buffer +=
> req->req.actual;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 805
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 806 /* DMA Address */
> 5a012f67cbcb20 Alexis Lothoré 2017-05-10 807
> _nbu2ss_writel(&preg->EP_DCR[num].EP_TADR, (u32)p_buffer);
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 808
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 809 /* Number of transfer
> packets */
> 75d9c393763da3 Alexis Lothoré 2017-05-10 810 mpkt =
> _nbu2ss_readl(&preg->EP_REGS[num].EP_PCKT_ADRS) & EPN_MPKT;
> 599b87809594e2 Janani Ravichandran 2016-02-11 811 dmacnt = length / mpkt;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 812 lmpkt = (length % mpkt)
> & ~(u32)0x03;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 813
> 2866914ce1f84f Cristina Moraru 2015-09-29 814 if (dmacnt >
> DMA_MAX_COUNT) {
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 815 dmacnt =
> DMA_MAX_COUNT;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 816 lmpkt = 0;
> 2866914ce1f84f Cristina Moraru 2015-09-29 817 } else if (lmpkt != 0) {
> 2866914ce1f84f Cristina Moraru 2015-09-29 818 if (dmacnt == 0)
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 819 burst =
> 0; /* Burst OFF */
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 820 dmacnt++;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 821 }
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 822
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 823 data = mpkt | (lmpkt <<
> 16);
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 824
> _nbu2ss_writel(&preg->EP_DCR[num].EP_DCR2, data);
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 825
> 75d9c393763da3 Alexis Lothoré 2017-05-10 826 data = ((dmacnt & 0xff)
> << 16) | DCR1_EPN_DIR0 | DCR1_EPN_REQEN;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 827
> _nbu2ss_writel(&preg->EP_DCR[num].EP_DCR1, data);
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 828
> 2866914ce1f84f Cristina Moraru 2015-09-29 829 if (burst == 0) {
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 830
> _nbu2ss_writel(&preg->EP_REGS[num].EP_LEN_DCNT, 0);
> 75d9c393763da3 Alexis Lothoré 2017-05-10 831
> _nbu2ss_bitclr(&preg->EP_REGS[num].EP_DMA_CTRL, EPN_BURST_SET);
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 832 } else {
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 833
> _nbu2ss_writel(&preg->EP_REGS[num].EP_LEN_DCNT
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 834
> , (dmacnt << 16));
> 75d9c393763da3 Alexis Lothoré 2017-05-10 835
> _nbu2ss_bitset(&preg->EP_REGS[num].EP_DMA_CTRL, EPN_BURST_SET);
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 836 }
> 75d9c393763da3 Alexis Lothoré 2017-05-10 837
> _nbu2ss_bitset(&preg->EP_REGS[num].EP_DMA_CTRL, EPN_DMA_EN);
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 838
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 @839 result = length &
> ~(u32)0x03;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 840 req->div_len = result;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 841
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 842 return result;
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 843 }
> 33aa8d45a4fea3 Magnus Damm 2014-06-06 844
>
> :::::: The code at line 839 was first introduced by commit
> :::::: 33aa8d45a4fea3dc5d90338aad0867a66e0c38d5 staging: emxx_udc: Add Emma
> Mobile USB Gadget driver
>
> :::::: TO: Magnus Damm <damm+rene...@opensource.se>
> :::::: CC: Greg Kroah-Hartman <gre...@linuxfoundation.org>
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
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